CVE-2017-6519

Publication date 30 April 2017

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

9.1 · Critical

Score breakdown

avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.

Mitigation

Block udp port 5353 at perimeter firewall

Status

Package Ubuntu Release Status
avahi 18.10 cosmic
Fixed 0.7-4ubuntu2.1
18.04 LTS bionic
Fixed 0.7-3.1ubuntu1.2
17.10 artful Ignored end of life
17.04 zesty Ignored end of life
16.10 yakkety Ignored end of life
16.04 LTS xenial
Fixed 0.6.32~rc+dfsg-1ubuntu2.3
14.04 LTS trusty
Fixed 0.6.31-4ubuntu1.3
12.04 LTS precise Ignored end of life

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
avahi

Severity score breakdown

Parameter Value
Base score 9.1 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references